Merged from old philikon-aq-and-__parent__ branch:
Log message for revision 71221: Step 2: Make aq_acquire aware of __parent__ pointers, even if the object isn't acquisition wrapped. Log message for revision 71223: Add another test that tests acquisition wrappers with containers that have __parent__. Log message for revision 71225: Cosmetics: adjust a piece of code that I added earlier to the indentation style of the overall file Log message for revision 71226: Cleanup: * no need to introduce another variable where we check for a __parent__ attribute * clean up after failed getattr (it throws an AttributeError) * properly DECREF the __parent__ attribute when it's no longer needed and the wrapper that is temporarily created from the __parent__ attribute. Log message for revision 75578: Added a test to Acquisition that shows the current segmentation fault problem, when Acquisition goes in circles. Log message for revision 76140: First attempt to fix 'Acquisition problem' when encountering cyclic hierarchies via __parent__ pointers. [hannosch, nouri] In addition, Hanno and Nouri's fix was expanded to not only cover circular __parent__ pointers but also to cover a mixture of circular __parent__ and aq_parent pointers (which can occur when old Implicit acquisition meets new __parent__ pointer code). Also cleaned up much of the comments and added more comments.
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